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/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2014-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "trace/control.h"
#include "translate-all.h"
void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
{
TraceEventID id = trace_event_get_id(ev);
bool state_pre;
assert(trace_event_get_state_static(ev));
/*
* We ignore the "vcpu" property here, since no vCPUs have been created
* yet. Then dstate can only be 1 or 0.
*/
state_pre = trace_events_dstate[id];
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
trace_events_dstate[id] = 1;
} else {
trace_events_enabled_count--;
trace_events_dstate[id] = 0;
}
}
}
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
CPUState *vcpu;
assert(trace_event_get_state_static(ev));
if (trace_event_is_vcpu(ev)) {
CPU_FOREACH(vcpu) {
trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
}
} else {
/* Without the "vcpu" property, dstate can only be 1 or 0 */
TraceEventID id = trace_event_get_id(ev);
bool state_pre = trace_events_dstate[id];
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
trace_events_dstate[id] = 1;
} else {
trace_events_enabled_count--;
trace_events_dstate[id] = 0;
}
}
}
}
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
TraceEvent *ev, bool state)
{
TraceEventID id;
TraceEventVCPUID vcpu_id;
bool state_pre;
assert(trace_event_get_state_static(ev));
assert(trace_event_is_vcpu(ev));
id = trace_event_get_id(ev);
vcpu_id = trace_event_get_vcpu_id(ev);
state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
set_bit(vcpu_id, vcpu->trace_dstate);
trace_events_dstate[id]++;
} else {
trace_events_enabled_count--;
clear_bit(vcpu_id, vcpu->trace_dstate);
trace_events_dstate[id]--;
}
}
}
static bool adding_first_cpu(void)
{
CPUState *cpu;
size_t count = 0;
CPU_FOREACH(cpu) {
count++;
if (count > 1) {
return false;
}
}
return true;
}
void trace_init_vcpu(CPUState *vcpu)
{
TraceEvent *ev = NULL;
while ((ev = trace_event_pattern("*", ev)) != NULL) {
if (trace_event_is_vcpu(ev) &&
trace_event_get_state_static(ev) &&
trace_event_get_state_dynamic(ev)) {
TraceEventID id = trace_event_get_id(ev);
if (adding_first_cpu()) {
/* check preconditions */
assert(trace_events_dstate[id] == 1);
/* disable early-init state ... */
trace_events_dstate[id] = 0;
trace_events_enabled_count--;
/* ... and properly re-enable */
trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
} else {
trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
}
}
}
}
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